TM 10-3930-659-34 5-2. CYLINDER LINERS MAINTENANCE (Con’t). WARNING Compressed  air  used  for  cleaning  or  drying  purposes,  or  for  clearing  restrictions,  should  never exceed 30 psi (207 kPa).  Wear protective clothing (goggles/shield, gloves, etc.) and use caution to avoid injury to personnel. 3. Remove loose material from six cylinder liners (4) with compressed air. 4. Remove plug (5) from engine (1). 5-13